<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../reactBag/react.development.js"></script>
    <script src="../reactBag/react-dom.development.js"></script>
    <script src="../reactBag/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>


    <script type="text/babel">

        class App extends React.Component{
            state = {
                isHot:true
            }

            render(){
                const {isHot} = this.state
                return (
                    <div>
                        <button onClick = {this.fn}>切换天气</button>
                        {
                            isHot?
                            <div><p>今天真冷</p></div>
                            :
                            <div><p>今天真热</p></div>
                        
                        }
                        
                    </div>
                )
            }
            fn = () => {
                const {isHot} = this.state
                this.setState({isHot:!isHot})
            }
        }
        ReactDOM.createRoot(document.getElementById('app')).render(<App/>)

    </script>
</body>

</html>